How to add a html link tag to a page which uses a layout shared across an application from sitecore.

See more:

ASP.NET

HTML

I have an application built on ASP.net and Sitecore.The application uses a common layout(.aspx file) from sitecore.

Now I have to add a link tag(<link rel="xxx" href="yyy" />) under head section to a single page.To achieve this,I have to edit common layout but the link tag should appear only on the page I want and not on other pages.How can I achieve this?

I got the below code to add to my common layout.aspx but it is not working and I don't understand what it does.

<% string currentURL = Request.RawUrl;
if (currentURL == "/") {%>
<link rel="xxx" href="yyy" />
<% } %>

why we use <% %>?